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Oracle allows you to create a query with aggregate functions referring to a remote table. For example, if your query includes two tables: one from the local schema and another from the remote database. You can simply use a database link in Oracle to create that construction. Previously, we already talked about converting database links using a linked server. But the problem is that SQL Server Migration Assistant (SSMA) for Oracle doesn’t convert queries that refer to the remote objects through the database link. So, when you try […]

Oracle uses database links to access objects on another database. In SQL Server you can use linked server or an OPENQUERY function to emulate that functionality. The problem is that SQL Server Migration Assistant (SSMA) for Oracle doesn’t automatically convert database links. Instead, when you try to convert a query that refers to the remote objects through the database link, SSMA will generate an error O2SS0083.

A major bank in Europe that we’ve been working with over the years wanted to get help in upgrading SQL Server 2008 to 2016. Since we performed the migration process originally from DB2 to SQL Server we had a deep knowledge of the customer’s data. Because of the need to have a highly available system and they could not afford to be down, they needed a way to downgrade to the old database system in case somthing bad happens to the upgraded system. Also, our […]

One of the leading medical software providers maintained their complex healthcare system with thousands of unique users. Developing over time, this system became overloaded and unsafe. So our customer contacted us to update their system in order to meet the HIPAA standards. After thorough research, we came up with a decision to migrate their databases from SQL Server 2008 to Azure SQL Database. As a result, the customer benefited tremendously from enabling modern high availability and disaster recovery facilities, with better visibility and control of […]

In Oracle, you may use specific interval literals that indicate a certain period of time. SQL Server does not have a direct analog for interval literals. Thus, when trying to convert interval literals using  SQL Server Migration Assistant (SSMA) for Oracle, you will get an error O2SS0086. The term literal refers to a fixed data value just as the constant value term. You can specify interval literals in terms of years and months or in terms of days, hours, minutes, and seconds. Oracle Database supports two […]

Oracle uses specific interval expressions to store a period of time. SQL Server does not have a direct analog for this data type. Thus, when you try to convert interval expressions using  SQL Server Migration Assistant (SSMA) for Oracle, you will get an error O2SS0006. Your source Oracle code may include 2 kinds of intervals: INTERVAL YEAR TO MONTH and INTERVAL DAY TO SECOND. The first one stores the difference in years and months, while the second type stores the difference in days, hours, minutes […]

A leading provider of payroll and HR services in the United States faced the difficulties with configuring the Azure elastic pools for the needs of their SaaS Azure app. The Azure tools provided by Microsoft were not flexible enough to fine-tune the performance of 20,000 customer databases with different utilization patterns. Moreover, it was almost impossible to maintain so many databases manually. We came up with the solution that allows automatic management of the customer databases basing on extensive monitoring of elastic […]

SQL Server has several different ways of implementing the same behavior as an Oracle materialized view. SSMA cannot understand the original optimization reason for why the application needed the materialized view, so SSMA flags certain conditions as an error. This blog post discusses error O2SS0522 where the Oracle materialized view includes FLOAT columns, WHERE or GROUP BY clauses, subqueries, UNION, MINUS, INTERSECT, etc. Currently SQL Server Migration Assistant (SSMA) for Oracle converts materialized views to SQL Server indexed views. While converting […]

Running your database migration projects, you may have already noticed that AWS Schema Conversion Tool (SCT) automatically generates an additional schema called extension pack. This schema emulates the system functions and specific features of the source database in your target DB instance. In the following video, we demonstrate how to apply this extension pack to the OLTP database. And in our future blog posts we will talk about working with extension pack for data warehouses. Make sure to check out our […]

An international healthcare company felt the urge to migrate core components of their application initially to Azure Infrastructure-as-a-Service (IaaS) with a long-term goal of transferring the solution to Azure Platform-as-a-Service (PaaS). We came up with a solution that automates the ‘lift and shift’ migration of their existing Linux-based MongoDB Cluster (dozens of virtual machines) to Azure IaaS. We created the cloud automation script that allows not only to deploy  the customer’s system but also to upgrade and scale it in […]